Connect the probes to the digital multimeter.
Connect the black probe to the com (common) port and the red probe to the port marked with the Ohm symbol which looks like an upside down horseshoe. For those of you who remember Greek, the Ohm symbol is the Greek letter Omega.
This digital multimeter has banana jacks for the port plugs. Other digital multimeters may have screw in terminals or BNC plugs.